Balance Sheet Detail (Inventories) (Details) - USD ($) $ in Millions	Jul. 31, 2016	Oct. 25, 2015
Inventories
Customer service spares	$ 432	$ 382
Raw materials	461	461
Work-in-process	392	271
Finished goods	741	719
Total Inventories	2,026	1,833
Inventory at customer locations included in finished goods	183	155
Inventory, finished goods, evaluation inventory, net of reserves	$ 205	$ 185